Pressure sensitive adhesive composition, pressure sensitive adhesive sheet for batteries, and lithium-ion battery

A method of manufacturing a battery, comprising:

• preparing a pressure sensitive adhesive sheet comprising a base material and a pressure sensitive adhesive layer laminated on one side of the base material;
• and
• fixing two or more conductors in a state in which the two or more conductors are in contact with each other in the battery using the pressure sensitive adhesive sheet, wherein the pressure sensitive adhesive layer is formed of a pressure sensitive adhesive composition comprising:
• a (eth)acrylic ester polymer having a main chain containing (meth)acrylic alkyl ester monomer units having a carbon number of an alkyl group of 6 or more and 20 or less, carboxy group-containing monomer units, and 5 to 35 mass % of alicyclic structure-containing monomer units
• wherein the (meth)acrylic ester polymer has a glass-transition temperature of lower than 0° C.

A battery comprising a pressure sensitive adhesive sheet and an electrolyte solution, wherein:

• the pressure sensitive adhesive sheet is provided at a site in the battery in which there is a possibility of contact with the electrolyte solution:
• the pressure sensitive adhesive sheet comprises a base material and a pressure sensitive adhesive layer laminated on one side of the base material;
• and
• the pressure sensitive adhesive layer is formed of a pressure sensitive adhesive composition comprising,
• a (meth)acrylic ester polymer containing, as monomer units that constitute the meth)acrylic ester polymer, a (meth)acrylic alkyl ester monomer unit having a carbon number of an alkyl group of 6 or more and 20 or less, a carboxy group-containing monomer unit and an alicyclic structure-containing monomer unit, wherein
• the (meth)acrylic ester polymer has a glass-transition temperature of lower than 0° C. and
• the pressure sensitive adhesive composition comprises a silage coupling agent in an amount of 0.01 to 5.0 mass parts to 100 mass parts of the (meth)acrylic ester polymer.